Using OpenDNS Updater on a machine running a VPN

I have set up a WAN device so others in my household are using OpenDNS (I'll call this Router 2) but my main PC mostly uses my own router (Router 1).

I swap to Router 2 to use the OpenDNS Updater app as it's a dynamic IP network, but my PC is primarily using Router 1 and I run a subscription VPN (think Nord, Proton, Express VPN etc.) which currently I'm working around by disconnecting the VPN, then connecting to Router 2, updating the OpenDNS Updater app, then returning back to my main network on Router 1 to continue using my VPN.

I'm a halfwit when it comes to computing so I'm wondering if there's a way to run a VPN through Router 1 without it effecting Router 2 which is connected to Router 1 on a WAN port or whether doing so would make OpenDNS just stop working?